RE: Lab in Photoshop
RE: Lab in Photoshop
- Subject: RE: Lab in Photoshop
- From: Henrik Holmegaard <email@hidden>
- Date: Mon, 15 Jul 2002 12:03:32 +0200
bruce fraser <email@hidden> wrote:
>
It's much less of an issue in RGB-to-CMYK conversions performed by
>
the CMM, because that conversion uses a much higher precision (20
>
bits in the case of the Adobe CMM) and hence has less quantization
>
error than a conversion into 8-bit Lab.
In the classic device independent capture workflow the idea was to correct
the prescan in LCh and complete the transform in one 16 bit step from RGB to
CMYK (a single LUT is built from source to destination to minimize rounding
error). Finescanning into Lab allowed the second half of the conversion to
be completed at any place and at any time in the downstream workflow. But
editing was not the focus for 8 bit Lab capture software. With 16 bit Lab
capture software this perspective has changed as also the option to edit not
only the pixels but as well the profiles. Just how large a step the OS/X
version of the capture software takes away from the OS 8 and OS 9 classic
version I guess we'll see pretty soon.
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